package com.learn.egcar1.base.filters;

import com.learn.egcar1.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

//WebFilter注解：配置拦截器的名称和需要拦截的请求的路径Path
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = {"/v1/vehicle/*","/v1/weibo/*"})
public class LoginCheckFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        Filter.super.init(filterConfig);
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //登录状态校验
        log.debug("使用过滤器实现登录状态校验");
        //HttpServletRequest类是ServletRequest的子类;
        //此处需要用到子类的方法，所以需要进行类型转换;
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取会话
        HttpSession session = request.getSession();
        UserVO userVO = (UserVO) session.getAttribute("user");
        if (userVO == null){
            //重定向
            response.sendRedirect("/login.html");
        }else {
            //放行
            filterChain.doFilter(servletRequest,servletResponse);
        }
    }

    @Override
    public void destroy() {
        Filter.super.destroy();
    }
}
